@Article{HenriquesNaUsPaRaAb:2017:PhGiMa,
author = "Henriques, A. B. and Naupa, A. R. and Usachev, P. A. and Pavlov,
V. V. and Rappl, Paulo Henrique de Oliveira and Abramof, Eduardo",
affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)} and {Ioffe Institute} and {Ioffe Institute}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Photoinduced giant magnetic polarons in EuTe",
journal = "Physical Review B",
year = "2017",
volume = "95",
number = "4",
pages = "045205",
abstract = "Photoinduced magnetic polarons in EuTe, with a magnetic moment of
several hundred Bohr magnetons, were investigated as a function of
pump intensity and temperature by pump-probe Faraday rotation. The
quantum efficiency for optical generation of magnetic polarons is
found to be 0.09. The pump-intensity dependence of the
photoinduced Faraday rotation shows a sublinear increase, from
which we deduce that the population of photoexcited polarons is
limited by a maximum value of 4.5x10(15) cm(-3). This is four
orders of magnitude less than the concentration of polarons that
would completely fill the crystal, which suggests that the
photoexcited polarons are anchored by defects. In addition to the
generation of polarons, at high pump densities the modulated pump
light also causes a small alternating heating of the illuminated
region. The temperature dependence of the polaron magnetic moment
is well described by the Curie-Weiss law. Above 100 K, polarons
are thermally quenched with an activation energy of 11 meV.",
doi = "10.1103/PhysRevB.95.045205",
url = "http://dx.doi.org/10.1103/PhysRevB.95.045205",
issn = "1098-0121",
language = "en",
urlaccessdate = "27 abr. 2024"
}